table of contents
| Algorithm::CheckDigits::M11_009(3pm) | User Contributed Perl Documentation | Algorithm::CheckDigits::M11_009(3pm) |
NAME¶
CheckDigits::M11_009 - compute check digits NRIC (SG)
SYNOPSIS¶
use Algorithm::CheckDigits;
$nric = CheckDigits('nric_sg');
if ($nric->is_valid('S1234567D')) {
# do something
}
$cn = $nric->complete('S1234567');
# $cn = 'S1234567D'
$cd = $nric->checkdigit('S1234567D');
# $cd = 'D'
$bn = $nric->basenumber('S1234567D');
# $bn = 'S1234567';
DESCRIPTION¶
ALGORITHM¶
- 1.
- Beginning left every digit is weighted with 2, 7, 6, 5, 4, 3, 2
- 2.
- The weighted digits are added.
- 3.
- The sum from step 2 is taken modulo 11.
- 4.
- The checkdigit is 11 minus the sum from step 3 converted to a character
according to the following table:
@cd = ('','A','B','C','D','E','F','G','H','I','Z','J', );
METHODS¶
- is_valid($number)
- Returns true only if $number consists of seven
digits (optional preceded by a letter out of 'F', 'G', 'S', 'T') followed
by a valid letter according to the algorithm given above.
Returns false otherwise,
- complete($number)
- The check letter for $number is computed and
appended to the end of $number.
Returns the complete number with check digit or '' if $number does not consist solely of digits and letters.
- basenumber($number)
- Returns the basenumber of $number if
$number has a valid check digit.
Return '' otherwise.
- checkdigit($number)
- Returns '' if $number is valid.
Return undef otherwise.
EXPORT¶
None by default.
AUTHOR¶
Mathias Weidner, "<mamawe@cpan.org>"
SEE ALSO¶
perl, CheckDigits, www.pruefziffernberechnung.de,
| 2021-11-17 | perl v5.40.0 |